Re: [PATCH v2 2/3] KVM: TDX: Fix the exit reason handling

[Edgecombe, Rick P]

On Wed, 2026-08-12 at 15:29 +0800, Xiaoyao Li wrote:
> Well, actually the added comment cannot be shared. For the 
> EXIT_REASON_EPT_MISCONFIG case, the reason to return a synthesized 
> invalid Exit Reason is to differentiate with the case of 
> TDVMCALL(ept_violation), where the exit reason is updated to EPT_MISCONFIG.

Ah, yea. You are right.

> 
> In fact, we don't need such trick for real EPT_MISCONFIG, because there 
> is handling for real EPT_MISCONFIG in tdx_handle_exit()
> 
> 	if (unlikely(vp_enter_ret == EXIT_REASON_EPT_MISCONFIG)) {
> 		KVM_BUG_ON(1, vcpu->kvm);
> 		return -EIO;
> 	}
> 
> before the handling of transformed EPT_MISCONFIG from 
> TDVMCALL(ept_violation)
> 
> 	switch (exit_reason.basic) {
> 	...
> 	case EXIT_REASON_EPT_MISCONFIG:
> 		return tdx_emulate_mmio(vcpu);
> 
> But it's not urgent to fix it and it's not mandatory to enable Bus Lock 
> VM exit on TDX. Let's leave it to the follow-up series.

Ok.